package com.zhentao.filter;

import com.zhentao.utils.common.AppJwtUtil;
import io.jsonwebtoken.Claims;
import org.apache.commons.lang.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;


/**
 * @data 2024/2/24 10:01
 * @Author xdm
 **/
@Component
public class WeMediaLoginFilter implements Ordered, GlobalFilter {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //1.获取request和response对象
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();

        System.out.println(request.getURI().getPath()+"过滤器-");
        //2.判断是否是登录
        if(request.getURI().getPath().contains("/login")){
            //放行
            return chain.filter(exchange);
        }


        //3.获取token
        String token = request.getHeaders().getFirst("token");

        System.out.println("token"+token);
        //4.判断token是否存在
        if(StringUtils.isBlank(token)){
            System.out.println("没有token");
            response.setStatusCode(HttpStatus.UNAUTHORIZED);

            return response.setComplete();
        }

        //5.判断token是否有效
        try {
            Claims claimsBody = AppJwtUtil.getClaimsBody(token);
            //是否是过期
            int result = AppJwtUtil.verifyToken(claimsBody);
            if(result == 1 || result  == 2){
                response.setStatusCode(HttpStatus.UNAUTHORIZED);
                return response.setComplete();
            }
            //获得token解析后中的用户信息
            Object userId = claimsBody.get("id");
//在header中添加新的信息
            ServerHttpRequest serverHttpRequest = request.mutate().headers(httpHeaders -> {
                httpHeaders.add("userId", userId + "");
            }).build();
//重置header
            exchange.mutate().request(serverHttpRequest).build();
        }catch (Exception e){
            e.printStackTrace();
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        //6.放行
        return chain.filter(exchange);
    }

    /**
     * 设置优先级，数字越小优先级越高
     * @return
     */
    @Override
    public int getOrder() {
        return 0;
    }
}